* {
  margin: 0;
  padding: 0;
}
.box {
  margin: 0 auto;
  width: 960px;
  height: 300px;
  background-color: skyblue;
  position: relative;
  transition: background-image 0.2s ease-in-out;
}

.box > img {
  width: 960px;
  height: 300px;
}
.left {
  position: absolute;
  height: 50px;
  width: 30px;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  background-color: gray;
}

.right {
  position: absolute;
  height: 50px;
  width: 30px;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  background-color: gray;
}
.box-1 {
  width: 960px;
  height: 100px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: red;
}
.circle {
  margin: 0 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: white;
  cursor: pointer;
}
.active {
  background-color: green;
}
